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The Proof is in the Powder

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In this activity, learners will design a way to identify a powder found at a crime scene by comparing it with known powders, with the goal of solving a crime. Learners will describe the various physical properties of chemicals and will discover how to use deductive reasoning to solve problems. This activity includes optional extensions where learners can compare chemical and physical changes, determine whether household substances are acids or bases, and repeat this activity using additional challenges.

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A project of University of California, Berkeley's Lawrence Hall of Science. Major funding was provided by the National Science Foundation (Award #0735007), The Camille & Henry Dreyfus Foundation, and Oracle.